SSC CGL Computer – Networking – Devices, Topologies & Protocols – Exam-Level Drill

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SSC CGL Computer – Networking – Devices, Topologies & Protocols – Exam-Level Drill – 16 questions, subject: Computer Knowledge. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
A company links 9 servers in a full mesh instead of a ring. How many extra cables does the mesh need?

Correct Answer: A [27]

Explanation:

Mesh 9 × 8 ÷ 2 = 36; ring 9; extra 27.

2.  
In a full mesh, every device uses 14 ports for mesh links. How many cables does the whole network have?

Correct Answer: D [105]

Explanation:

Ports = n − 1 = 14 → n = 15; cables = 15 × 14 ÷ 2 = 105.

3.  
How many usable host addresses are there in a /28 IPv4 network?

Correct Answer: C [14]

Explanation:

Answer: 14. h = 4 → 16 − 2 = 14.

4.  
Which is 172.16.4.1 written in binary?

Correct Answer: A [10101100.00010000.00000100.00000001]

Explanation:

172 = 128 + 32 + 8 + 4; 16 = 00010000; 4 = 00000100; 1 = 00000001.

5.  
How many of these addresses are Class C?
192.0.2.1 · 223.255.1.1 · 224.0.0.5 · 191.168.1.1

Correct Answer: B [2]

Explanation:

192 and 223 lie in 192–223; 224 is D; 191 is B → two.

6.  
Match the followingMatch the protocol with its well-known port:
P. SSH Q. Telnet R. IMAP S. SNMP
1. 22 2. 161 3. 143 4. 23

Correct Answer: D [P-1, Q-4, R-3, S-2]

Explanation:

SSH 22 · Telnet 23 · IMAP 143 · SNMP 161.

7.  
Assertion–Reason
A: Replacing a hub with a switch reduces unnecessary traffic on a LAN.
R: A switch learns MAC addresses and forwards each frame only to the port where the destination is.

Correct Answer: A [Both A and R are true and R explains A]

Explanation:

The hub floods all ports; the switch sends to one – that is the reason.

8.  
Statement-basedWhich of the following is/are correct?
I. An IPv6 address is 128 bits long.
II. A MAC address is given to a computer by the DHCP server each time it joins.

Correct Answer: D [Only I]

Explanation:

IPv6 128 bits; the MAC is fixed in the network card – DHCP gives the IP address.

9.  
Two-quantity comparison
Quantity I: usable hosts in a /27 network
Quantity II: cables in a full mesh of 8 devices

Correct Answer: A [Quantity I > Quantity II]

Explanation:

Answer: Quantity I > Quantity II. QI = 30; QII = 28 → QI > QII.

10.  
A building has a main switch joined to 5 floor switches; each floor switch serves 8 computers. With no loops (tree), how many links are there in all?

Correct Answer: B [45]

Explanation:

Devices = 1 + 5 + 40 = 46; tree links = n − 1 = 45 (or 5 + 40).

11.  
Which OSI layer is responsible for data format, encryption and compression?

Correct Answer: C [Presentation]

Explanation:

Presentation (6) translates, encrypts and compresses.

12.  
On a LAN, a computer knows another computer's IP address but needs its MAC address to send a frame. Which protocol finds it?

Correct Answer: C [ARP]

Explanation:

ARP = Address Resolution Protocol: IP → MAC.

13.  
Odd one outWhich statement is NOT correct?

Correct Answer: A [UDP re-sends lost data and delivers it in order]

Explanation:

That is TCP's job; UDP gives no such guarantee.

14.  
A user wants to see which routers a packet passes through on its way to a website. Which Windows command shows this?

Correct Answer: B [tracert]

Explanation:

tracert traces the route hop by hop; ipconfig shows own IP; nslookup asks DNS; getmac shows MAC.

15.  
Statement-basedWhich of the following is/are correct?
I. The Internet uses packet switching: packets of one message may take different routes.
II. In circuit switching, no path is reserved before the communication starts.

Correct Answer: D [Only I]

Explanation:

Circuit switching reserves a dedicated path first – the old telephone network.

16.  
Which access method is used by Wi-Fi, where a radio cannot hear a collision while it is sending?

Correct Answer: C [CSMA/CA]

Explanation:

Wi-Fi avoids collisions (CA); classic wired Ethernet detects them (CD).

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 Computer Knowledge book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-computer-knowledge

📘 SSC CGL 2026 – Computer Knowledge (Tier II Paper I – Section III)
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